1552116781 has 2 divisors, whose sum is σ = 1552116782. Its totient is φ = 1552116780.

The previous prime is 1552116653. The next prime is 1552116791. The reversal of 1552116781 is 1876112551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 908479881 + 643636900 = 30141^2 + 25370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1552116781 - 2⁷ = 1552116653 is a prime.

It is a super-2 number, since 2×1552116781² = 4818133003723603922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1552116781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1552116791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776058390 + 776058391.

It is an arithmetic number, because the mean of its divisors is an integer number (776058391).

Almost surely, 2^1552116781 is an apocalyptic number.

It is an amenable number.

1552116781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1552116781 is an equidigital number, since it uses as much as digits as its factorization.

1552116781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 37.

The square root of 1552116781 is about 39396.9133435603. The cubic root of 1552116781 is about 1157.8211132280.

The spelling of 1552116781 in words is "one billion, five hundred fifty-two million, one hundred sixteen thousand, seven hundred eighty-one".